Process for the preparation of stone slabs.



TH'EODOR VOGT, OF HEILIGENBERG, GERMANY.

PROCESS FOR THE PREPARATION OF STONE SLABS.

Specification of Letters Patent.

Patented Feb. '27, 1912.

Application iledNovember 2, 1910. Serial No. 590,287,

To` all'whom 'it may concern."

Be it known that I, THEonoR Voor, a subject of the King of Prussia,residing at Heiligenberg, in Alsace-Lorraine, Germany,

have invented certain new and useful Improvements in Processes for thePreparation of Stone Slabs, of which the following is a specification. l

My invention relates to a process for the manufacture of blocks or slabsfrom pieces of stone, and especially from hard stone fragments. Thepaving' of side walks,

yards, and the like can be easily and quickly effected by the aid ofsuch slabs, and the .l5 work becomes much cheaper with equal or evengreater suitability of the paving.

Owing to the fact that the surface is separated by little interstices,the slab can never become so slippery as with a completely plane '20surface, and the coating with ice is more-orv less prevented, so thatthere are many advantages connected with the practical use of theinventions The usefulness of the slabs is continuously increasinginasmuch as the cement forming the. connecting ele ment,- becomesconstantly harder in the air. The process. consists in embedding thestones in cement and'pouring cement liquor -over them. 'In order,however, to prevent this cement liquor attaching itself to the uppersurface of the stones also, from which it could only be removed afterdrying with great trouble, the upper surface of the stones is coatedwith a somewhat greasy preparation so that on lightly striking thesamethe cement poured can fall away and any remains thereof which stilladlierecan easily be washed olf. As a .suitable material for -thiscoating, a solution of the deposit lette, or loam found in sand stonecrevices has been proved when dissolved in `water to be serviceable,which solution, after beingw'ell diluted is 'applied to the surface ofthe stones which are then subsequently poured over with cement.

An apparatus suitable for carrying out the process constituting thepresent inven-v tion 1s 'shown inthe accompanying drawf.

' ing, in which:

Figure '1" is a plan 'viewof one of the iron frames used in themanufacture of thestone .slabsg'Fig 2 is' a vertical section through.4one of the stone slabs while in the process of.

'formation'; 4and-Fig. 3 is a sectional plan '55" through the cementmass showing the interwoven rods'hereinafter referred to.

Theapfparatus employed consists ofiron frameso which the twolongitudinal sides a are held together by means of the screws b at theirends. The cross bars d rest in grooves c of the longitudinalbars,'whereby the surface is subdivided into divisions corresponding tothe requisite size of the` slabs.

4In these divisions there is4 'then-'placed a mixture of sandv andcement to about one quarter of the height, and interwovenrods the stonesurface can easily be brushed andv washed olf andthe slab can be used atonce. The kind ofstones, the thickness ofthe slabs, and so forth, 'canbe adjusted as may be required by thespecial circumstances6 'I claim: I

1. Process for the preparation of stone slabs, which consists'ininserting a mass of sand and cement in a suitable frame and. embedding-anetwork of interwoven bars in said mass, then embedding. stones in saidmass in'such a manner that interstices are formed between them, and thenpouring cement liquid over the upper surface of the body so as to fillin said interstices.

2. Process for the preparation of stone slabs, which consists ininserting a cement mass in a suitable frame' and embedding a network ofinterwoven barsci'nsaid mass,

then embedding stones in said mass in such y a manner that intersticesare formed between them, then applying' a greasy sub# stance to theupper surface of the stones' `which is adapted to resist cement liquid,and finally filling in said inteistices between the stones with cementliquid.

3'. Process'for the preparation of stone slabs, which consists ininserting a layer consisting of sand and cement in a suitable.' frame,then placing a wide-ineshed network of interwoven bars upon said layer,then placing a layer of pure cement over said first named layer and saidinterwoven bars, then embeddingv stones in said layer olf i roi theV'stones Whichvis adapted to resist cement liquid, and finallyfilling insaid nterstiees between the stones with cement liquid.

5. Process for the preparation of stone.

Ament in such a manner that interstices are placing a-layer of purecement over said.

first named layer and said interwoven hars.

then embedding stones in said layer of ve- ;Qlnent in such a manner thatinterstiees are formed between theni, then applying a greasy substanceto the -npper surfaces of slabs, which consists in inserting a layerConsisting of .sand and vement in a suitable. frame, then placing awide-meshed network of interwoven bars upon said layer, then placing; alayer of pure cement over said first .named layer and said interwovenbars, then embedding pieces of granite'in said layer of cement in such amanner that interstices are formed between theni` then applying a greasysubstance*Consisting of a solution of lette to the upper .Martin-es ofthe pieces of graniter` and inall)v filling in said interstices withcementliquid.

IIn testi1nonv whereof I alix my signature in presenceoftwo'\\'itnesses..

THEODOR VOGT. tiles-ses Slnornnn HAUSER, AUGUST Oos'rnnsnxx.

Cop'ies of this patent may be obtained fox tive cents each, byaddressing the Commissioner of Patents, Washington, D. C.

